Using A Global Address For The Ethernet/Ip Unit - Omron CJ1W-EIP21 Operation Manuals

4 Determining IP Addresses
4-3-3

Using a Global Address for the EtherNet/IP Unit

Communications
over Internet
● Intranet
Global address
IP router
Private address
Firewall
Communications
in intranet
 Conditions for Communications Applications
You can use the explicit message communications service over the Internet under the following con-
ditions.
• A device such as a personal computer (a CIP application including the Network Configurator) can
connect online and communicate over the Internet with an EtherNet/IP Unit that has a global
address.
• The TCP port number (44818) or UDP port number (44818) that is used for EtherNet/IP cannot be
used because it is prohibited by a firewall in the communications path.
Precautions for Correct Use Precautions for Correct Use
Network Security and Firewalls
To set a global IP address for an EtherNet/IP Unit involves network security considerations. It is
recommended that the user contract with a communications company for a dedicated line, rather
than for a general line such as a broadband line. Also, be sure to consult with a network special-
ist and consider security measures such as a firewall. After a firewall has been set up by a com-
munications technician, there may be some applications that cannot be used. Be sure to check
first with the communications technician.
4-12
● Intranet
Ethernet (EtherNet/IP)
Firewall
IP router
● Internet
Global address
Ethernet (EtherNet/IP)
Controller
EtherNet/IP Unit: Global address
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
CIP client on a computer,
such as Network
Configurator
Private address
Cannot connect to Internet
(required)
Cannot connect to Internet
Private address